Germany’s parliament is set to approve a direct role in the battle against ISIL in Syria, answering France’s appeal for help with the deployment of reconnaissance jets, a frigate and up to 1,200 troops.

Germany's parliament is set to approve a direct role in the battle against the Takfiri group, ISIL (so-called Islamic State in Iraq and Levant), in Syria, answering France's appeal for help with the deployment of reconnaissance jets, a frigate and up to 1,200 troops.

The parliamentary vote comes three weeks after the Takfiris killed 130 people in a series of attacks in Paris, prompting France to invoke a clause requiring EU states to provide military assistance to wipe out the ISIL group in Iraq and Syria.

The military mission, which is expected to be approved as Chancellor Angela Merkel's left-right coalition has an overwhelming majority, could become Germany's biggest deployment abroad.

Justice Minister Heiko Maas said the case for deployment was watertight legally.

"The Germans can be certain that the deployment to Syria neither violates international law nor the constitution," he told the Tagesspiegel on Friday.

"We must stop this terrorist gang of murderers. That will not be achieved with military action alone, but neither would it be achieved without," he said.

The package being considered by parliament includes six Tornado aircraft which have no offensive fighter capability and are specialised in air-to-ground reconnaissance.

A German frigate is intended to protect the Charles de Gaulle, from which French fighter jets are carrying out bombing runs, and the tanker aircraft could refuel them mid-air to extend their range.